S
M
T
W
T
F
S
31
80°
69°
1
80°
68°
2
81°
70°
3
80°
70°
4
78°
68°
5
75°
67°
6
76°
66°
7
82°
67°
8
79°
67°
9
75°
67°
10
75°
68°
11
75°
67°
12
75°
68°
13
74°
65°
14
74°
67°
15
77°
68°
16
81°
67°
17
83°
68°
18
81°
69°
19
77°
69°
20
75°
67°
21
77°
66°
22
79°
68°
23
78°
67°
24
77°
67°
25
74°
66°
26
71°
66°
27
75°
67°
28
76°
65°
29
76°
65°
30
75°
64°
1
75°
61°
2
75°
62°
3
73°
63°
4
73°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in National City
National City's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in National City. See also: October | November | December.
